fix: Add Copy trait to JobStatus and BatchStatus enums

Enables passing enum values by value in MySQL batch operations
instead of borrowing, fixing compilation error in mysql.rs:530.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: CodingAnarchy

src/batch.rs

@@ -43,7 +43,7 @@ impl Default for PartialFailureMode {
 }
 
 /// Current status of a job batch.
-#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq, Eq)]
 pub enum BatchStatus {
     /// Batch is waiting to be processed.
     Pending,

src/job.rs

@@ -41,7 +41,7 @@ pub type JobId = Uuid;
 /// let is_final = matches!(status, JobStatus::Completed | JobStatus::Dead | JobStatus::TimedOut | JobStatus::Archived);
 /// assert!(is_final);
 /// ```
-#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq, Hash)]
+#[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq, Eq, Hash)]
 pub enum JobStatus {
     /// Job is waiting to be processed by a worker.
     Pending,